1 - AS 2570-1982 PRINTING SPECIFICATIONS FOR OPTICAL CHARACTER RECOGNITION
4 - PREFACE
4 - CONTENTS
5 - 0 Introduction
5 - 0.1 Interpretation of the International Standard
5 - 0.2 Use of the International Standard
6 - 0.3 Annexes
6 - 1 Scope and field of application
6 - 2 References
6 - 3 Spectral requirements
6 - 3.1 General
6 - 3.2 Spectral bands
6 - 4 Paper specifications for OCR
6 - 4.1 General
6 - 4.2 Luminous reflectance factor of paper
7 - 4.3 Dirt in paper
8 - 4.4 Paper opacity
8 - 4.5 Variation in reflectance of paper
8 - 5 Characteristics of the printed image
8 - 5.1 General
8 - 5.2 Print quality tolerance ranges
9 - 5.3 Definition of character outline limits
14 - 5.4 Measurements of parameters
23 - 6 Character positioning
23 - 6.1 General
23 - 6.2 Document reference edges
23 - 6.3 Character boundary
24 - 6.4 Character skew
24 - 6.5 Line boundary
24 - 6.6 Field
24 - 6.7 Horizontal positioning of characters within a line
25 - 6.8 Character alignment within a line
25 - 6.9 Printing area
25 - 6.10 Clear area
26 - 6.11 Margin
26 - 6.12 Line separation
26 - 6.13 Line spacing
28 - Annex A - Paper characteristics and measurements
28 - A.1 Spectral properties
28 - A.2 Paper opacity
29 - A.3 Paper gloss
29 - A.4 Variation in paper reflectance
32 - Annex B - Characteristics of the printed image
32 - B.1 General
32 - B.2 Best fit
32 - B.3 Basic values
32 - B.4 Spectral bands for PCS
33 - B.5 Average PCS
33 - B.6 Spots and voids
34 - B.7 Strokewidth ranges
34 - B.8 Spots remote from a character
34 - B.9 Recommendation for lower-case OCR-B characters
35 - Annex C - Computer-aided method (CAM) of print quality measurement
35 - C.1 Introduction
35 - C.2 Scanning device
36 - C.3 Generation of COL gauges
37 - C.4 Pre-processing of scanned characters
38 - C.5 Evaluation of print parameters
41 - C.6 Output of the measurement
44 - Annex D - Character positioning
44 - D.1 Objectives of the character positioning requirements
44 - D.2 Document reference edge
44 - D.3 Clear area, printing area and margin
44 - D.4 Line spacing
45 - D.5 Line separation
45 - D.6 Character boundary
45 - D.7 Character spacing
45 - D.8 Character separation
45 - D.9 Character misalignment